<template>
  <h4>当前求和为：{{sum}}</h4>
  <button @click="sum++">点我++</button>
  <hr>
  <h2>姓名：{{name}}</h2>
  <h2>年龄：{{age}}</h2>
  <h2>薪资：{{job.j1.salary}}K</h2>
  <button @click="name+='~'">修改姓名</button>
  <button @click="age++">增长年龄</button>
  <button @click="job.j1.salary++">涨薪</button>
</template>
<script>
import {ref,reactive,toRefs,readonly,shallowReadonly} from 'vue'
export default {
  name: 'Demo',
  setup() {
    // 数据
    let sum = ref(0)
    let person = reactive({
      name: '张三',
      age: 18,
      job: {
        j1: {
          salary: 20
        }
      }
    })
    
    // person = readonly(person)
    // person = shallowReadonly(person)
    // sum = readonly(sum)
    // sum = shallowReadonly(sum)

    // 返回一个对象（常用）
    return {
      sum,
      ...toRefs(person)
    }
  }
}
</script>
